Apparatus for cutting diamonds



June l2, 1923.

E. F. A. C. LEPERRE APPARTUS FOR CUTTING DIAMONDS Filed Jan. 8, 1921 4,Sheets-Sheet l I 1 I Uu z 3 kf 4 w 3 da. ml H 7 .l .1. H NA .Inventor i 51, t

June .12, 1923. A 1,458,768

' E. F. A. C. LEPERRE APPARATUS FOR CUTTING DIAMONDS Filed Jan. e, 1921 4 sheets-sheet 2 June 12, 1923. 1,458,768

E. F. A. C. LEPERRE n APPARATUS FOR CUTTING DIAMONDS Filed Jan. 8, 1921 I 4 Sheets-Sheet- 5 milf I l T P Flg. 3.

. Jnventur:

.lune` 12, 1923. 1,458,768

` E. F. A. c. I EPERRE APPARATUS FOR CUTTING DIAMONDS I Filed Jan. 8. 1921 4 Sheets-Sheet 4 Patented June12,4 1923.`

l UNUEFD EMILE FERDINAND' ADELINCVHALES. I .Ernannor 'AN'.rwnR'P, BELGIUM."- I

APPARATUS FoaoUTrING .DLauvroNDsQ` v lapplicationnea January s, 192,1.,l seria1'Np.,43e,oos.

T o all whom concern.' l, .5

'Be 4it knownk that-1,EMI`L'E .FERDINAND ADELIN CHABLESLEBERRE, a subject of ythe King :of Belgium, residing at46 rue du i Champ, Berchem, Antwerp, Belgium, have invented .certain new andusefuh Im rovements .Relating to- Apparatus for'r utting Diamonds, of which. .the followingv is. a specification.. Y a' i y 110 The present invention has'k :for .object employed-by the lapidary.

The upward movement, thatfisrto'salyithe separation of the diamond from the grindfst`one is eiectedby the thrust ofi-the lower end of a pistoncarried by the apparatus supporting the diamond carrier. the 'thrust being applied upon a plate fixed upon the work table ynearthe grinding Wheel.l rThe said pistonis released at the desired ymoment by electro-,magnetic meansY in which the .cur-

rent from abattery issues throughthe needle of aldialindicator whichcontrols the .movement ofthe apparatus during the cutting operation Vv e v i j In order to .render as clear as possible the explanations which follow, the apparatus Y su`pportin,f the i diamond vcarrier "and provided "with the automatic' means for lifting j the diamond clear of the stone is represented by way ofexample i-n the accompanying drawing in which,- y

l Fig. .1'isasectionfal elevation vof ratusy provided according tothe invention,

the view being, taken `von Ffi,'0 `;.2.` n Fig. 2 is asectionon the line A--B ofFig- 'ure1. 1 e

,.Fig. 3,is as plan Figs.. lj andawhiie the .line yof VView cori-espending5 to 5' 1L .it a transparent covervplate 4 p thejhollow receptacle of which 'the rear part .ofY the vapparatus vis formed.y y -3 comprises a ydial31 upon4 which a needle lparts ,of aslide 7 and is toothed', wheels' 5 and 51.

.I'wh'eels 5V and 5,1 fQlSill. @1161-111 s v y Vapparatus Itowards; 'its blase'and at its rear 'end by the pivot pinsf 27`fan`d 271.' -The Inountinghplatfesnfor the ends of the spindle f1)y arerepresented at 24 and 24:1,v The toothed filfonring 22g. The cOre`20 is-eXteIldGdbY' Coppeepieceus; which eittum carries.

Fig. 4 is a view on-a smaller scale ofizthe whole apparatus.

The-"apparatus comprisesl an arinlfad-` vantageofusly of aluminum uponwhich is mounted vthe iron jaws 2 forming the front. end .of the apparatus. The holder 25.4 which carries; the-f stone to be [cut` is supported by a rod which fis .gripped between; the aws `2v means of a I screwed pin"28.", "y The rear part of the apparatus'is hollow and lreceives the controlling mechanism of an Vvindicator 3. whose dial has mounted upon ywhich closes The indicator forming a .point of contact` 39' turns. f At 2 0 on the dial is providd'a' 'second .point of yContact 4Q..- The needle is controlled by a push. bar 32-which Ais disposedbetween two y.

controlled by the latter... O n'e, of vthefpaits-of theL slide 7 consists ofa regulable part'f? 1 whichpermits of'V taking upV the-play between A the push bar 3? andthe. slideff7v. The slidetravels in two. guides 8 andjl` formed respectively by the covers 29 and 291` f ,formed a'groove in wh'ich a controlling lever 10 is received and'y which lever isl integrally providedupon thespindle `9 carrying two fTlieu controlling lever' 1,0,is yprovided with va'fspiral 'spring 6 by which contact is'maintained'between the leven` "7 1() and 'the slide 7'., f The"toothed `engage in the toothed secwhich .are carried in the vis. disposed. under the, action of, ai spiral spring 21'of vcopper whichcontacts' with an 'I Iii pawl 18 provided advantageously of steel. The chamber containing the solenoid is closed by a base plate 14. The copper piece 19 connecting the pawl 18 to the core 20 slides in the massive extension 17 of the bobbin of the solenoid 23.

The pawl 18 retains a piston lipdisposed under the action of a spiral spring 16, the whole being disposed within a sleeve 12 closed .by a cover 13. The piston carries upon its circumference at a determined height a recess in which engages the pawl 18 for maintaining the piston at a certain distance from the plate 30 which is placed upon the work table 33.

Batteries 32 and 321 are provided in the lateral spaces at the rear of the apparatus, these spaces being closed by closing plates 34:.

The apparatus carries a lengthening rod 31; when the stone to be cut lies upon the grindstone 26 the apparatus is held in place bykmeiins of holding rods 36 and 37 which are fixed on the work table. y

As will be clearly understood from the drawing and frorntlie constructiondescribed, the separation of the apparatus from the work table or more exactly the degree of the angle formed between them, is controlled by the indicator 3 through the toothed sectors 11 which are applied upon the table and which control the gears 5 which by means of the lever 10 and the slide 7 cause the needle of the indicator 3 to turn. lVhen this needle indicates 0. contact is-established between the points 39 and 10 and the circuit of the batteries 32 and 321 passing through the solenoid 23 is closed. Thus the core 20 is attracted towards the iron ring 22 thus withdrawing the pawl 18; the piston 15 being libera-ted it is forced by the spring 16 downwardly and takes its position upon the plate 30. theapparatus under the second pressure being lifted and the diamond uplifted from the stone.

To remove from the diamond a determined thickness the indicator 3 is set by turning the dial until the needle indicates the determined thickness. For example to remove la thickness of 0.3 inm. the dial is turned until the needle indicates ,30, supposing the dial to indicate to 1/100th of a millimetre, in cutting` the needle approaches the point ofcontact at o and when the stone has been ground .away to the extent of 0.3 mm. the .contact is ,established and the apparatus is raised as hereinbefore described. I claim: 1. Appai'atus .for supporting. ,precious .stones for grinding in a grinding machine and for automatically lifting the vcarrier for the precious stone on the required extent of grinding having been effected` comprising a bar adapted to beifreely supported at'o'ne end and at the other to support the said carrier in position over the grind-stone,

mechanism mounted upon the said bar and operable on the variation of its inclination as the grinding of the precious stone proceeds, and means for lifting the end of the said bar supportingv the said carrier on a determined inclination being reached, substantially as described. 2.Apparatus for supporting precious stones for grinding in a. grinding machine and for automatically lifting the carrier for the precious stone on Vthe required extent of `grinding having been effected, comprising a bar adapted to be freely supported at one end and at the other to support the said carrier in position over the grind-stone, mechanism mounted upon the said bar and operable on the variatio'nof its inclination as the grinding ofthe precious stone proceeds, means forliftiiig the end of the said bar supporting the said carrier 0n a determined inclination being reached, and means for maintaining the said freely supported bar against the effect of movement of the grinding stone, substantially as described.

3. Apparatus for supporting precious stones for grinding in a grinding machine and for automatically lifting the carrier foi` the precious stone on the required extent of grinding having been effected, comprising a bar adapted to .be freely supported aty one end and at the other to support. the said carrier in position'over the grind stone, mechanism mounted upon the bar and operable on the variationk of its inclinationas the grinding of the precious stone proceeds, said mechanism comprising. a movable indicator traversing a dial, theindicatorand Adial being provided with contacts connected within an electric circuit, and means f or Aof grinding having been effected, comprising a bar adapted to be freely supported at carrier in position over the grind-stone,

lifting the'end of the said bar supporting 105 ,thev said carrier on a determined inclination being reached, substantially as de-V one end and at the otheito support the said i mechanism mounted upon the said bar and f operableron the' variation of its inclination as the grinding of the precious stone proceeds, and means lcomprising a spring operated 'piston for liftingthe end of the bar supporting the said carrier on a determined inclination of the said bar being attained,

'substantially as described.

5. Apparatus for stones for grinding in a grinding lmachine and for automatically lifting the carrier for thek precious stone on ythe required extent a bar adapted to be freely supported at one "no of grinding'having been effected, comprising v.M1215 supporting precious end and at the other to support. the said carrier in position over the grlnd-stonc, mechanism mounted on the said Ibar operable on the variation of its inclination as the grinding of the precious stone proceeds, comprising a sliding bar and slide, means for the release of the said slide on a deterof the said bar 10 

